Botrytis cinerea mainly occurs in greenhouse cultivation, and leaves, flowers and fruits are affected. The incidence of leaves is mostly "V"-shaped from the tip of the leaf, and the lesion is light-colored to yellow-brown. The diseased part is dry and bears sallow brown mold; when the flower is sick, it causes burnt flowers; the fruit is seriously affected by the green fruit. First, from the residual flower and stigma, the dye is developed, and then the fruit is developed, resulting in soft rot of the young fruit. The diseased spot on the green fruit before maturity is grayish-white, and then the gray mold is dense on the fruit surface. In recent days, there is more rain and less light, which causes continuous low temperature and high humidity in the shed, which is extremely unfavorable to the growth of tomato, which will lead to the occurrence of gray mold. It is expected that all local vegetable farmers will attach great importance to it and strengthen the prevention of gray mold in tomato flowering stage.
Prevention opinions:
1. Choose sunny day to do a good job of ventilation and ventilation in the greenhouse, drain moisture management, reduce the humidity inside the shed. The relative humidity of the air in the shed does not exceed 65%, which is one of the effective measures to control and prevent the occurrence of Botrytis cinerea. At the same time, pay attention to remove the dust from the shed film to ensure sufficient light in the shed.
2. Remove the diseased leaves, diseased fruits, and diseased branches, and take them out of the shed to concentrate or bury them or burn them to reduce the source of bacteria. At the same time, a little lime is disinfected around the diseased plant, combined with disease prevention, and high-efficiency foliar fertilizer such as potassium dihydrogen phosphate is used for root dressing to promote robust growth and improve disease resistance.
3. Chemical control: 0.2% procymidone WP can be added when formulating plant growth regulator, which can effectively prevent gray mold bacteria from infecting flower organs and reduce the occurrence of diseased fruit. It is also possible to use 65% sulfur bacteria, mildew 1000 times liquid, 50% more, mildew 1000 times liquid, 50% different bacteria urea 1000 times liquid, etc., spraying and controlling once every 7 days, for 2 to 3 times in succession, pay attention to The above agents are used alternately, and both sides of the blade should be sprayed on both sides.
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